| abstract |
The performance of double receptor, specific binding assays is improved by use of a receptor complex having the structure n n A.sub.BL (BL).sub.n A.sub.1 n n wherein BL is a binding ligand, A BL is a receptor specific for binding ligand, A 1 is a receptor, BL is covalently bonded to A 1 and A BL is reversibly bonded to BL. Generally A BL is absorbed onto an insoluble surface and A 1 is an antibody to the substance being assayed. The complex has particular utility in coated tube and rechargeable radioimmunoassay systems. |